/usr/share/zsh/functions/Completion/Base/ is in zsh-common 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/zsh/functions/Completion/Base/_all_labels
/usr/share/zsh/functions/Completion/Base/_all_matches
/usr/share/zsh/functions/Completion/Base/_alternative
/usr/share/zsh/functions/Completion/Base/_approximate
/usr/share/zsh/functions/Completion/Base/_arg_compile
/usr/share/zsh/functions/Completion/Base/_arguments
/usr/share/zsh/functions/Completion/Base/_bash_completions
/usr/share/zsh/functions/Completion/Base/_cache_invalid
/usr/share/zsh/functions/Completion/Base/_call_function
/usr/share/zsh/functions/Completion/Base/_call_program
/usr/share/zsh/functions/Completion/Base/_combination
/usr/share/zsh/functions/Completion/Base/_comp_locale
/usr/share/zsh/functions/Completion/Base/_complete
/usr/share/zsh/functions/Completion/Base/_complete_debug
/usr/share/zsh/functions/Completion/Base/_complete_help
/usr/share/zsh/functions/Completion/Base/_complete_help_generic
/usr/share/zsh/functions/Completion/Base/_complete_tag
/usr/share/zsh/functions/Completion/Base/_correct
/usr/share/zsh/functions/Completion/Base/_correct_filename
/usr/share/zsh/functions/Completion/Base/_correct_word
/usr/share/zsh/functions/Completion/Base/_describe
/usr/share/zsh/functions/Completion/Base/_description
/usr/share/zsh/functions/Completion/Base/_dispatch
/usr/share/zsh/functions/Completion/Base/_expand
/usr/share/zsh/functions/Completion/Base/_expand_alias
/usr/share/zsh/functions/Completion/Base/_expand_word
/usr/share/zsh/functions/Completion/Base/_extensions
/usr/share/zsh/functions/Completion/Base/_external_pwds
/usr/share/zsh/functions/Completion/Base/_generic
/usr/share/zsh/functions/Completion/Base/_guard
/usr/share/zsh/functions/Completion/Base/_history
/usr/share/zsh/functions/Completion/Base/_history_complete_word
/usr/share/zsh/functions/Completion/Base/_ignored
/usr/share/zsh/functions/Completion/Base/_list
/usr/share/zsh/functions/Completion/Base/_main_complete
/usr/share/zsh/functions/Completion/Base/_match
/usr/share/zsh/functions/Completion/Base/_menu
/usr/share/zsh/functions/Completion/Base/_message
/usr/share/zsh/functions/Completion/Base/_most_recent_file
/usr/share/zsh/functions/Completion/Base/_multi_parts
/usr/share/zsh/functions/Completion/Base/_next_label
/usr/share/zsh/functions/Completion/Base/_next_tags
/usr/share/zsh/functions/Completion/Base/_normal
/usr/share/zsh/functions/Completion/Base/_nothing
/usr/share/zsh/functions/Completion/Base/_oldlist
/usr/share/zsh/functions/Completion/Base/_pick_variant
/usr/share/zsh/functions/Completion/Base/_prefix
/usr/share/zsh/functions/Completion/Base/_read_comp
/usr/share/zsh/functions/Completion/Base/_regex_arguments
/usr/share/zsh/functions/Completion/Base/_regex_words
/usr/share/zsh/functions/Completion/Base/_requested
/usr/share/zsh/functions/Completion/Base/_retrieve_cache
/usr/share/zsh/functions/Completion/Base/_sep_parts
/usr/share/zsh/functions/Completion/Base/_sequence
/usr/share/zsh/functions/Completion/Base/_set_command
/usr/share/zsh/functions/Completion/Base/_setup
/usr/share/zsh/functions/Completion/Base/_store_cache
/usr/share/zsh/functions/Completion/Base/_sub_commands
/usr/share/zsh/functions/Completion/Base/_tags
/usr/share/zsh/functions/Completion/Base/_user_expand
/usr/share/zsh/functions/Completion/Base/_values
/usr/share/zsh/functions/Completion/Base/_wanted